Bring the rice wine, water, soy sauce, pepper, 1 tsp of the salt, and the sugar to a boil in a skillet.,Reduce the liquid over high heat to about half its original volume, add the cornstarch mixture, and cook for 30 seconds.,While the sauce is reducing, rub the fish fillets with the remaining 1 tsp salt and the toasted sesame oil and set aside.,______,Take it off the heat and let sit for another 5 minutes, covered.,Transfer the fish fillets to a serving platter, pour the sauce over them, and sprinkle with the green onions.